Joomla 1.0 . Very very old and EOL . I suggest you to to update your joomla to the latest joomla version(now it s 3.7.2) and your php version too, as with this it s very possible to get hacked and also you will not find extensions. By the way All Videos not support joomla 1.0 .

The least risk is to not find some extensions that you used but i am sure that you will find similar to do your job. You can do the update local to your pc with xampp or wamp or uniform server and after when you will finish you copy your updated joomla site to your live server. Ofcource when you will have a joomla 3.7.2 site it s good to update your php version too as the version that you have now is not playing a joomla 3.x.x website.